Boom head



Jan. 30, 1945. E. W. TAYLOR ET AL.

BOOM HEAD Filed Jan. 51, 1944 2 sheets-sheet 1 @Q1/w ffwea W F1a/021.

Pe fer /V/e/o' Jan. 30; 1945.

E. W. TAYLOR ETAL BOOM HEAD 2 Sheets-Sheet 2 v Fild Jan. 51, 1944l 'Zag/012 Pf' /V/e/Jem Mn 525g v Patented Jan. 30, 19.45

U NITED- STATES :PATENT F1' nooM mann tiniest Taylor and refer', Nielsen, Bay (21tr, Mich., assigiioi-s `to Industrial' Brownhoist oar= poration; Bay city, Mich. v i I l' Y Appliationfrsnuary, l3"1, 1944, serial. No. 52o,5oe

" zelsims.- (c1. 212-144) This invention relates to booms ofthe type used lon cranes, excavators, and mechanismof4 similar character, and more particularly` to. the, boom various reeving sheaves thereon. y l.

One of the prime objects of theinvention is to design a boom head for cranes and heavy material handling equipment of asimilar nature in which any one of the rope'sheaves and its companion pin can 'be quickly and easily removed when not in use and replaced when the nature of the Work requires.

Another object is to provide a boom head ar- `head and the arrangement andmountingof the rangement in which the .back stay is independent of the 'sheave pins so that the sheaves and pins can be removed, replaced, and/or rearranged without in any manner affecting the back stay or the stay rope sup-port for thefboom.

A further object is to provide a boom head in which the sheaves are mounted at longitudinally sheave assemblies can rbe readily removed or added as required by the nature of the work to lbe accomplished, thereby eliminating excessive weight and aiecting a saving in the power required fo-r operation.

The invention may be more fully understood .from the following detailed description and explanation referringto the accompanying drawings illustrating the preferred embodiment orf the invention.

Fig. 1' is a side elevation view of a boom head embodying our invention.

Fig. 2 is a top plan view;

Fig. 3 is a view similar to Fig. 1 and showing an extension secured to the end of the boom;

Fig. 4 is a top plan view thereof, the sheaves being omitted. 1 v

Fig. 5 is an enlarged transverse sectional view taken on the line v5-5 of Fig. 3. x

Referring now more particularly to the drawings in which we have shown one embodiment of our invention, the letter B indicates a conventional lboom which can 'be of any desired design, the lower end being hingedly connected to a crane or excavator (not shown), and is pivoted for swinging movement in a vertical plane,

latticingl II' to forma rigidsitructure. VVertically disposed plates? I2 andi 3 forma part off the ibooinv head and are welded or otherwisel secured 'to the side Wal-ls of `said boom, these plates projecting aboveV and :bel-ow the boomvproper, andfstrips VI4 e are welded-*Ito the side Wallsof thejlQl-atesv4 to 'urther rein-force the structure. Bearing blocks I5 are welded to the inner face ofthe angles I I) and as clearly shown in Fig. 5 of the drawings, and plates I6 and I'I respectively are secured to the top and bottom of the sboom, these plates Ibeing A boom stay pin 2'Ivis mounted in openings 28 provided in the upper edges of the' side plates and the rope 29 is anchored thereto in the conventional manner.

The sheave pins can be secured in position in any approved manner, the instant design showing a `plate 30 Welded to one end ,of the pin, this plate covering the opening I9 and butting against the member 3|, which is weldedsyto the side plate I2. A similar member 32 is'welded to the opposite plate I3, and a detachable plate 33 is secured to this end of the pin by means of bolts 34, al1 as shown in Fig. 5 of the drawings,A and when it is desired to remove the pin, it is merely neces' t sary to remove the bolts 34 and the pin can then be shifted endwise from the boom head.

In the present instance the boom is shown as Heretofore, when' handling maximum loads with six parts of line, it has been customaryto mount the three sheaves 24, 25 and 26 side by side on a pin with the back stay for the boom attached to the same pin, consequently, it was necessary to remove the back stay in order to rmove'any one or more of the sheaves, and it was also necessary to make-the boom suiliciently wide Figs. 1 and 2 of the drawings, inasmuch as the.v e

maximum load can be handled only at the mini; mum radius and the loading is such that at maximum radius it requires one sheave on1y,'there fore it will be obvious that considerable weight can be eliminated by removing the two sheaves 24 and 25.

Under certain conditions where minimum load is to be handled at maximum radius, it is advantageous to provide a boom extension E as clearly shown in Figs. 3, 4 and 5 of the drawings, such extension being of the same general construction as the main body of the boom and is held in place by means of bolts 35. Horizontally aligned openings 36 are provided in the side walls of said extension and accommodate the sheave pin 31 on which the sheave 38 is journaled, with such ar- `the boom while changes are being made.

From the foregoing description it will be obvious that we have perfected a simple, practical,

economical boom head arrangement for cranes and excavating equipment in general.

What We claim is:

1. In a boom for cranes and similar apparatus.

5 the combination at the head end of the boom, of

vertically disposed side plates projecting above y and below said boom and rigidly secured thereto. horizontally aligned sheave pin openings in said plates in staggered, longitudinally spaced rela- 10 tion, quickly removable sheave pin and sheave assemblies mounted in said openings, and an individual stay pin removably mounted in the upper section of said plates.

2. In a boom for cranes and similar apparatus,

1j. the .combination at the head end of the boom, of

vertically disposed side `plates extending above and below said boom and rigidly secured thereto, horizontally aligned sheave pin openings in said plates in staggered, longitudinally spaced rela- 2o tion, quickly removable sheave pin and sheave assemblies mounted in said openings, an individual stay pin removably mounted in the upper section of said plates, a boom extension detachably attached to .the end of the boom beyond 25 said plate members, and a sheave assembly journaled on said extension.

ERNEST W. TAYLOR. BETER N'IELSEN. 

